Trait rug::ops::SubFromRound[−][src]

pub trait SubFromRound<Lhs = Self> {
    type Round;
    type Ordering;
    fn sub_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering;
}

Compound subtraction and assignment to the rhs operand with a specified rounding method.

Examples

use core::cmp::Ordering;
use rug::{
    float::Round,
    ops::{SubAssignRound, SubFromRound},
    Float,
};
struct F(f64);
impl SubFromRound<f64> for F {
    type Round = Round;
    type Ordering = Ordering;
    fn sub_from_round(&mut self, lhs: f64, round: Round) -> Ordering {
        let mut f = Float::with_val(53, lhs);
        let dir = f.sub_assign_round(self.0, round);
        self.0 = f.to_f64();
        dir
    }
}
let mut f = F(5.0);
let dir = f.sub_from_round(3.0, Round::Nearest);
// 3.0 - 5.0 = -2.0
assert_eq!(f.0, -2.0);
assert_eq!(dir, Ordering::Equal);

Associated Types

`type Round`[src]

The rounding method.

`type Ordering`[src]

The direction from rounding.

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Required methods

`fn sub_from_round(&mut self, lhs: Lhs, round: Self::Round) -> Self::Ordering`[src]

Performs the subtraction.

Examples

use core::cmp::Ordering;
use rug::{float::Round, ops::SubFromRound, Float};
// only four significant bits
let mut f = Float::with_val(4, 0.3);
let dir = f.sub_from_round(-3, Round::Nearest);
// −3.3 rounded up to −3.25
assert_eq!(f, -3.25);
assert_eq!(dir, Ordering::Greater);

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Implementors

`impl SubFromRound<&'_ f32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &f32, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ f64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &f64, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ i8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &i8, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ i16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &i16, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ i32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &i32, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ i64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &i64, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ i128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &i128, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ u8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &u8, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ u16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &u16, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ u32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &u32, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ u64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &u64, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ u128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &u128, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ Float> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &Float, round: Round) -> Ordering`[src]

`impl SubFromRound<&'_ Integer> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: &Integer, round: Round) -> Ordering`[src]

`impl SubFromRound<f32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: f32, round: Round) -> Ordering`[src]

`impl SubFromRound<f64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: f64, round: Round) -> Ordering`[src]

`impl SubFromRound<i8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: i8, round: Round) -> Ordering`[src]

`impl SubFromRound<i16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: i16, round: Round) -> Ordering`[src]

`impl SubFromRound<i32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: i32, round: Round) -> Ordering`[src]

`impl SubFromRound<i64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: i64, round: Round) -> Ordering`[src]

`impl SubFromRound<i128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: i128, round: Round) -> Ordering`[src]

`impl SubFromRound<u8> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: u8, round: Round) -> Ordering`[src]

`impl SubFromRound<u16> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: u16, round: Round) -> Ordering`[src]

`impl SubFromRound<u32> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: u32, round: Round) -> Ordering`[src]

`impl SubFromRound<u64> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: u64, round: Round) -> Ordering`[src]

`impl SubFromRound<u128> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: u128, round: Round) -> Ordering`[src]

`impl SubFromRound<Float> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: Float, round: Round) -> Ordering`[src]

`impl SubFromRound<Integer> for Float`[src]

`type Round = Round`

`type Ordering = Ordering`

`fn sub_from_round(&mut self, lhs: Integer, round: Round) -> Ordering`[src]

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